[2/4] gdi32: Fix the advance width in synthetic bold glyphs when using scaling factors. (resend, try2)

[Akihiro Sagawa]

Just resend try 2 patch because font.c:389 failures should be fixed by
the previous patch.

Try 2:
    - Rename the vector normalization function name and returns
      calculated value.
    - Avoid division by zero.
    Thanks Huw and Henri.

Signed-off-by: Akihiro Sagawa <sagawa.aki at gmail.com>
---
 dlls/gdi32/freetype.c   | 50 ++++++++++++++++++++++++++++++++++---------------
 dlls/gdi32/tests/font.c | 10 ++++++++++
 2 files changed, 45 insertions(+), 15 deletions(-)

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